CI: add one

.gitlab-ci.yml

@@ -0,0 +1,20 @@
+image: python:3-alpine
+
+# Also run CI for Merge requests
+workflow:
+  rules:
+    - if: $CI_PIPELINE_SOURCE == 'merge_request_event'
+    - if: $CI_COMMIT_TAG
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
+
+before_script:
+#  - python --version ; pip --version  # For debugging
+  - pip install flake8 -qq
+
+test:
+  script:
+    # ignore long lines
+    - flake8 --ignore=E501 cleanmedia
+  artifacts:
+    paths:
+      - cleanmedia